It would clunk from a stop when I let the clutch out, and when abruptly opening or closing the throttle in lower gears. If your bushings are bad you can see them under the rear axle where it bolts to the trailing arms that lead toward the front of the car.

The bolt should go through the center of the bushing housing. you can actually see part of the bushing if it's really bad, since the axle bolt will be off-center so much.

The clunking comes from the axle bolt moving around inside the shot bushing and contacting metal.

I don't think turning would have any affect on the clunking. It's power application that tries to move the axle around.